Boat ESC's vs Car ESC's

[G1ST]

I'm curious as to why a car ESC can run at low and part throttle all day long and a boat ESC can't.
Also, why is it possible to blow up an ESC? I know that ripple current from inadequate batteries is a factor in a lot of ESC failures but isn't there a way to sense and have an ESC shut down if ripple current is extreme? Are the components that would sense and react quickly enough prohibitively expensive? Is the technology even out there?
Just thought I would toss this out to the gurus.

Greg

[1truckerdan]

As I understand the way it works....In a land vehicle the highest amp load is at take off and drops as you get to speed...
in a water craft the amp draw is more at speed.
Anyone else can chime in to add or correct me if this is not correct.
Daniel

[lohring]

Road vehicles operate at much lower loads than propeller driven vehicles. The big loads in a car come when it's accelerating. Even in a race, that's less than 1/2 the time. The propeller loads in a boat are much higher and more constant. On top of that, the load increases sharply as a surface piercing propeller moves in and out of the water. See the chart below from a simple acceleration run.

Lohring Miller

Model test 05 06.jpg

[G1ST]

Interesting stuff.

Is a brushless scale boat with a sub surface drive a similar application to a car but our fast surface drive stuff is all peak amps, voltage drops and rpm's?

Why can't our boat ESC's handle part throttle? Would we have to sacrifice top end power?

I'm trying to get my thick head around why I can't have it all.

Greg